Casing for electric-lamp sockets



Feb. 5,. w29. 1,701,215

f A. C. RECKER GASING FOR ELECTRIC LAMP' SOCKETS Filed Sept. 4. 1926 lso Patented Feb. 5, 1929.

` Awarren STATE.

ADOLPH C. BECKER, F OAKVILLE, CONNIEIICIICU'T,l ASSIGNORITO CHASE COMPANIES y INC.` OF WATERBURY, CONNECTICUT, A CORPORATION. y j

CASING non ELECTRIC-LAM? Sooners.

Application filed September weakening the shell and the cap, and to sccuring a casing of neat and attractive appearance.

With these ends in view, my invention consists in a cap for the casings of electric lampsockets, the said cap having certain details vof construction as will'be hereinafter described and particularly pointed out in the claim.

In the accompanying drawings:

Fig. 1 is a view in side elevation of a casing for electric lamp-sockets constructed in accordance with my invention;

Fig. 2 ,is a similar view with the cap and shell separated from each other,'but arranged in line; v

Fig. 3 is a view of the cap and shell intransverse section on the line 33 of Fig. 1;

Fig. l is an enlarged segment of Fig; 3;

Fig. 5 is a detached reverse plan view of the cap; and Y l Fig. 6 is a broken, sectional view on the line 6 6 of Fig. 1. j

In carrying outkmy invention, as herein shown, the cap 10 and shell 11, which together constitute the socket-casin g, have the general form of the corresponding parts of standard electric-lamp socket-casings. The upper edge of the shell 11 is struck up soL as to form lwell-defined axial locking-ribs 12, separated by axial channels 13 wider than the extreme width of the said ribs-12 at the bases thereof.

This series of ribs and channels is interrupted by a deep key-slot 14, whichy provides not.

only for the usual key, but also for the springing of the shell necessary to disengage it fromv the cap. In socket-casings requiring no keyslot, such as 111, the shell must be slit to permit it to be sprung and so separated from the cap. At a point close to one edge of the key-slot 111, or the slit employed in place thereof, the shell is furnished with two outwardlyextending locking-projections 15 symmetri- 1 cally located toward the lower ends of two of the said channels and having parallel straight cut edges facing downwardly in a plane at a right angle to the axis of the shell'.

Another pair of projections 15 is formed in effectually resisted.` At the same time, the

4, isf/ze.. I serial No. 133,567. l

the shell at a point diametricallyopposite the projections 15 described, as 'shown in Fig. 3.

The 'cap 10 is rformed with a` plain, imperforate flange 1G and is so described to distinguish it fromcaps having actual perforations which are concealed by a supplemental band applied over the flange 16. The lower edge of the flange 1G is struck up to form a continuous series of inwardly-extending locking-projections 17, the cut upper edges 18 of which are straight and-located in line in a plane at a right angle to the axis of the cap. As shown, these locking-projections 17 are triangular in form. That form, however, is not essential, but it is essential that their cut upper edges shall be straightand in line as specicd.

At a point above this continuous line or fillet of locking-projections 17 the flange of the cap is provided at opposite` points in its circumference with a pair ofvinwardly-extending struck-upl locking-projections 1-9 having straight cut edges facing each other in planes parallel with the aXis of the cap. As shown, these locking-projections 19 arel f triangular, but thatform is not essential, al-

though' itzis essential that they shall have straight locking-edges facing eachother in planes parallel with the axis of the cap. I have shown two pairs of these anti-rotary locking-projectionsy 19, but'one pair would suffice and more than two pairs may be employed if preferred. j

It will be seen by reference to Fig. 2, that the ribs y12 and channels 13 are vlong enough Awith reference tothe width yof the flange 16 and the location of the projections 19 therein, so that when the cap and shell aretelescoped one into the other, the outer ends of any two pairs of adjacent ribs 12 of theshell will be in position lto engage with the cut edges 20 of the anti-rotary projections 19 of the cap,

-of which there are vtwo pairs.

parts pushed n home, irrespective' of their relative rotary position, a pair of the ribs 12,

at opposite points in the shell, will be inserted between the straight locking-edges 2O of the projections 19 of the two pairs of such projections whereby the relative rotary movement of the cap and shell is thereafter straight locking-edges of the two pairs of locking-projections 15 ot the shell will ride over the straight locking-edges or" two pairs of the locking-projections 17 of the cap, whereby the cap and shell will be locked togetherand so prevented from being pulled apart in line with their axes.

It will thus be seen that the locking of the cap and shell against relative rotary movement is devolved upon the ribs 12 or" the shell and the anti-rotary locking-projections 19 of the cap and that the locking or the cap and shell against being pulled apart is devolved upon certain pairs ot the lockingprojections 17 ot the cap in conjunction with the two pairs ot' locking-projeetions 15 struck out of the bottoms of two pairs or the channels 13 in the shell.

To disengage the cap and shell, it is only necessary to exert pressure upon the shell at point close to the edge et its slot 'le on Jdie side of the projections 15, which are thus sprung` sufficiently inward for the clearance of their straight cut lower edges from the straight cut upper edges 18 olf two of the locking-projections in the cap, aifter which, by a slight tilting or' the cap or shell, or hoth, they are readily drawn apart.

1n the construction shown and described, the size and spacing apart ol the ribs 12 and the size and spacing apart o'l the inwardlyexending locking-projections 17 is such that when the capand shell are combined, the upper corners 21 oit the said projections will engage with the sides of the ribs in such a mnner as to resist, to a very marked degree, the relative rotation of the cap and shell, which, on account ol such engagement, cannot be relatively rotated without exerting upon thein sutlicient twisting strain to cause the said corners to compress the Inetal of the shell to enable the corners to ride over the ribs. However, to guard against that contingency, l provide two pairs of anti-rotary lockingprojections 1.8, the relatively long` straight cut edges 1,9 oit which facing` each other engage with the long` sides oit the ribs 12, so as to con* stitute positive stops against relative rotar extending` locking projectioiis located to,-`r

ward the lower ends ot two oi the said channels and havi parallel straight-cut edges facing downward in a plane at a right ang-le to the axis or the shell; ot a cap Vior the said shell having' an unbanded, iinperforate flange formed adjacent to its edge with a continuous band of inwardly-struck locking projections, the cut upper edges of which arein line with each other in a plane at a right angle to the axis of the cap, and the said cap being` also provided at a point above the said band of locking` projections with. one or more pairs of inwardly-struck anti-rotary rprojections having' straightcut edges 'lacingeach other in planes parallel with t ie axis or the cap, the said continuous band of inwardly-struck locking projections ot the cap being positioned to coa-et with the said outwardy-'struck pair'of projections in the channels oit the shell, and the said anti-rotary projections oit lthe cap being positioned to coact with certain Vof the said locking-1ibs of the shell igor preventing the4 cap and shell from relative rotation when certain of the inwardlvstruclr 'locking projections or the cap are engaged with the ontwardly-struck locking` projections of `the shell to prevent the axial separation ort the cap and shell.

ln testimony wher-cot ll have signed this specification.

AnoLri-i lo. nnoiriin. y 

